Geodesic
Variational perturbation theory. $\varphi^{2k}$ oscillator
Teoretičeskaâ i matematičeskaâ fizika, Tome 90 (1992) no. 1, pp. 37-54 Cet article a éte moissonné depuis la source Math-Net.Ru

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Variational pertaarbation theory is used to study the anharmonic $\varphi^{2k}$ oscillator in the strong coupling limit. Nonpermrbative expressions are obtained for the vacuum energy, the Green's function, and the effective potential. 
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L. D. Korsun; A. N. Sisakyan; I. L. Solovtsov. Variational perturbation theory. $\varphi^{2k}$ oscillator. Teoretičeskaâ i matematičeskaâ fizika, Tome 90 (1992) no. 1, pp. 37-54. http://geodesic.mathdoc.fr/item/TMF_1992_90_1_a3/

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